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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770fc255c8bcfff71c2b3a8a29199c6e46a975e5b51b1eb7828becb7f7de84f9' 
  AND token = 'zmj7OSnjwfoAHT08vZ1QKfUXgTqBEFl7i2FWlk/5tK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}